. Author manuscript; available in PMC: 2016 Jan 5.

Published in final edited form as: Multivariate Behav Res. 2015 Sep-Oct;50(5):504–519. doi: 10.1080/00273171.2015.1068157

Table 3.

Simulation Study 1, Standardized Bias from Proration – Varied Item Means, Uniform Inter-Item Correlations

Parameter	Items Per Scale	Sample Size	MCAR Mechanism	MAR Mechanism Due to External Variable	MAR Mechanism Due to Complete Items on the Scale
Mean of X	8	200	0.7012^*	0.7728^*	1.3568^*
	8	500	1.1240^*	1.2362^*	2.1654^*

	16	200	0.6906^*	0.7664^*	1.2285^*
	16	500	1.1466^*	1.2802^*	2.0496^*

Mean of Y	8	200	0.7387^*	0.8150^*	1.4230^*
	8	500	1.1684^*	1.2916^*	2.2608^*

	16	200	0.7166^*	0.7914^*	1.2754^*
	16	500	1.1125^*	1.2375^*	1.9812^*

Variance of X	8	200	0.1587	0.6583^*	1.4043^*
	8	500	0.2602	1.1069^*	2.3601^*

	16	200	0.0703	0.6150^*	1.2319^*
	16	500	0.1132	1.0062^*	2.0031^*

Variance of Y	8	200	0.1740	0.7312^*	1.5637^*
	8	500	0.2680	1.1369^*	2.4294^*

	16	200	0.0574	0.5861^*	1.1870^*
	16	500	0.0976	0.9467^*	1.9038^*

Covariance	8	200	−0.0186	0.6930^*	0.3607
	8	500	−0.0124	1.1259^*	0.5993^*

	16	200	−0.0095	0.7182^*	0.3650
	16	500	−0.0228	1.1464^*	0.5798^*

Correlation	8	200	−0.0817	0.4814^*	−0.1322
	8	500	−0.1103	0.7818^*	−0.1942

	16	200	−0.0366	0.5282^*	−0.0687
	16	500	−0.0659	0.8415^*	−0.1098

Regression Coefficient	8	200	−0.0790	0.4670^*	−0.1279
	8	500	−0.1072	0.7622^*	−0.1841

	16	200	−0.0364	0.5022^*	−0.0684
	16	500	−0.0634	0.8075^*	−0.1080

Note. The table contains standardized bias values for conditions with a 25% item-level missing data rate. The inter-item correlations were uniform but the item means varied.

Standardized bias values greater than or equal to .40 in absolute value are denoted by an asterisk (*).